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Determine Soil Water Content Using Dielectric Dispersion Frequency

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131621175,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Jinghui Xu, Jinghui Xu
Keywords:   Dielectric Dispersion Frequency Soil Water Content soil dielectric properties FDR

Abstract. Frequency domain reflectometry, FDR, probes are an alternative to TDR probes that can provide an inexpensive measurement of soil water content. A fixed-frequency method is a common usage in the commercial FDR probe. It has some limitation for dry soil and sand moisture measurement. Researching the soil dielectric spectrum with a 6mm probe, we find that the dielectric dispersion frequency change with the water content changing when we use the same probe to measure. It has a strong relationship with the water content even though in the dry soil and sand. Measuring the dielectric dispersion frequency should be a good way for the soil water content measurement in which we don’t care about the type of soil, temperature and salt content changing.

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